Add support for Basque

Change-Id: I3a240f98f070eebcaba6b3091af2cef5e3304036
diff --git a/crowdin-aosp.yaml b/crowdin-aosp.yaml
index d2020aa..2657f30 100644
--- a/crowdin-aosp.yaml
+++ b/crowdin-aosp.yaml
@@ -30,6 +30,7 @@
     languages_mapping: &anchor
       android_code:
         ast: es-rXA
+        eu: eu
         ku: ku
         lb: lb
         ml-IN: ml